Survey of Warnimont Bluff, Wisconsin, November 2019

High lake levels are reducing beach area along the Lake Michigan coastline and allowing wave action to erode the bases of coastal bluffs at the highest rate of the past 30 years. Sediment budget calculations have shown that bluff erosion is the dominant source of sand and gravel-sized particles that are mobilized into beaches and the nearshore system. Researchers have found that the leading cause of bluff erosion is shallow to intermediate depth translational landslides. Therefore, estimating lake sediment budgets depends on an understanding of the mechanisms that lead to landslide failure. This study will provide a comprehensive analysis of bluff stability for bluffs affected by landslide failure coupled with an analysis of bluff composition to determine the composition of sediment contributions of coastal bluffs to the southeast Lake Michigan sediment budget.

This dataset is part of a series of repeat surveys documenting temporal changes to a ~100 m long extent of unconsolidated coastal bluffs on Lake Michigan.

高水位导致密歇根湖沿岸海滩面积缩减，同时使得波浪作用以过去30年中最快的速度侵蚀海岸悬崖的基础。沉积物预算计算表明，悬崖侵蚀是沙滩和近岸系统中移动的沙砾尺寸颗粒的主要来源。研究者们发现，浅层至中层深度的滑动滑坡是悬崖侵蚀的主要原因。因此，估算湖沉积物预算依赖于对导致滑坡失败机制的理解。本研究将对受滑坡失败影响的悬崖稳定性进行全面分析，并结合对悬崖组成的分析，以确定海岸悬崖对东南密歇根湖沉积物预算中沉积物贡献的组成。该数据集是记录密歇根湖约100米长的松散海岸悬崖随时间变化的系列重复调查的一部分。